feat: support creating account if not exists when account name is provided

[andyzhangx]

What type of PR is this?

/kind feature

What this PR does / why we need it:

feat: support creating account if not exists when account name is provided

if accountName is provided, and accountOptions.CreateAccount is set as true(by default false), this PR would create account if not exists

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

/hold

Does this PR introduce a user-facing change?

feat: support creating account if not exists when account name is provided

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

feat: support creating account if not exists when account name is provided

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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• OWNERS [andyzhangx]

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[coveralls]

Coverage increased (+0.01%) to 80.592% when pulling c27fe77 on andyzhangx:createAccountIfNotExists into 2e6c2a2 on kubernetes-sigs:master.

[andyzhangx]

/hold cancel
unit tests are added too

[andyzhangx]

/retest

[nilo19]

/lgtm